ESPRESSIF SYSTEMS ESPWROOMS2 Wi-Fi Module User Manual ESP WROOM S2 Datasheet EN pages

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ESP-WROOM-S2
Datasheet
Version 1.1
Copyright © 2016
About This Guide
This document introduces users to the specifications of ESP-WROOM-S2 hardware,
including the following topics.
Chapter
Title
Subject
Chapter 1 Overview
Introduction to ESP-WROOM-S2, including dimensions and
specifications.
Chapter 2 Pin Description
Introduction to pin layout and the relevant description.
Chapter 3 Functional Description
Description of the major functional modules and protocols applied on
ESP-WROOM-S2, including CPU, flash, memory and interfaces.
Chapter 4 Electrical Characteristics
Electrical data of ESP-WROOM-S2.
Chapter 5
 '$$
8BSOJOH

Release Notes
Date
2016.06
Version
V1.0
Release notes
First release.
Updated the operating temperature range;
2016.08
V1.1
Added NCC Wi-Fi standard;
Updated Section 3.4 Interface Description.
Table of Contents
1. Overview .................................................................................................................................1
2. Pin Description ....................................................................................................................... 3
3. Functional Description ............................................................................................................ 5
3.1.
MCU .......................................................................................................................................... 5
3.2.
Memory...................................................................................................................................... 5
3.2.1.
Internal SRAM and ROM .............................................................................................5
3.2.2.
SPI Flash ......................................................................................................................5
3.3.
Crystal Oscillator ....................................................................................................................... 6
3.4.
Interface Description ................................................................................................................. 7
4. Electrical Characteristics ........................................................................................................8
4.1.
Absolute Maximum Ratings....................................................................................................... 8
4.2.
Recommended Operating Conditions ....................................................................................... 8
4.3.
Digital Terminal Characteristics ................................................................................................. 8
4.4.
RF Performance......................................................................................................................... 9
4.5.
Sensitivity................................................................................................................................... 9
4.6.
Power Consumption ................................................................................................................ 10
4.7.
Reflow Profile...........................................................................................................................11
5. '$$
8BSOJOH .........................................................................................................................12
1. Overview
1.
Overview
Espressif provides the SMD module - ESP-WROOM-S2 that integrates ESP8266EX. The
module has received various adjustments to achieve better RF performance. We
recommend using ESP-WROOM-S2 for tests or for further development.
Note:
For more information on ESP8266EX, please refer to ESP8266EX Datasheet.
The module size is 16 mm x 23 mm x 3 mm (see Figure 1-1). The flash used on this
module is a 2 MB SPI flash connected to HSPI, with the package size of SOP 8-150 mil.
The gain of the on-board PCB antenna is 2 dBi.
The ESP-WROOM-S2 works as the SDIO/SPI slave with the SPI speed of up to 8 Mbps.
Figure 1-1. ESP-WROOM-S2 Module
Table 1-1. ESP-WROOM-S2 Specifications
Categories
Wi-Fi
Items
Specifications
Standards
FCC
Wi-Fi protocols
802.11 b/g/n
Frequency range
24M)[ ~ 24.)[
UART/I2C/GPIO/PWM/SDIO/SPI/IR Remote Control/
ADC
Peripheral interface
GPIO/PWM
Espressif
1/13
2016.08
1. Overview
Categories
Items
Specifications
Operating voltage
3.0V ~ 3.6V
Operating current
Average: 80 mA
Operating temperature range
-40°C ~ 85°C
Storage temperature
-40°C ~ 85°C
Package size
16 mm x 23 mm x 3 mm
External interface
Wi-Fi mode
Station/SoftAP/SoftAP + Station
Security
WPA/WPA2
Encryption
WEP/TKIP/AES
Firmware upgrade
UART Download / OTA (via network) / Download and
burn firmware via host
Hardware
Software
Software development
Supports Cloud Server Development
SDK for secondary development
Network protocols
IPv4, TCP/UDP/HTTP/FTP
User configuration
AT Instruction Set, Cloud Server, Android/iOS App
Note:
ESP-WROOM-S2 with high temperature range option (-40°C ~ 125°C) is available for custom order.
Espressif
2/13
2016.08
2. Pin Description
2.
Pin Description
Figure 2-1 shows the pin distribution of the SMD Module.
16.00
PCB ANTENNA
6.00
1.86
GND
EN
0.60 1.50
ADC_IN
3V3
IO16
RST
IO15
IO5
4.50
IO2
1:GND
23.00
TXD
15.70
RXD
IO0
4.50
IO4
SD1/INT
SD2/IO9
SD0/MISO
SD3/CS
SCLK
7.30
CMD/MOSI
GND
0.90
1.75
7.00
0.85
Unit: mm
Figure 2-1. Top View of The ESP-WROOM-S2
Table 2-1. ESP-WROOM-S2 Dimensions
Length
16 mm
Width
23 mm
Height
3 mm
PAD size (bottom)
0.9 mm x 0.85 mm
Pin Pitch
1.5 mm
ESP-WROOM-S2 has 20 pins, please see the pin definitions in Table 2-2.
Espressif
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2016.08
2. Pin Description
Table 2-2. ESP-WROOM-S2 Pin Definitions
No.
Pin Name
GND
Functional Description
Ground
3.3 V power supply (VDD)
3V3
Note:
It is recommended the maximum output current a power supply provides be of
500 mA or above.
IO16
GPIO16; used for Deep-sleep wake-up when connected to RST pin.
IO15
• UART download: pull down.
HSPICS
• SDIO boot: floating (internal pull-up) or pull up.
GPIO2; UART1_TXD
IO2
• UART download: pull down.
• SDIO boot: don’t-care.
GPIO0
IO0
• UART download: pull down.
• SDIO boot: don’t-care.
Espressif
IO4
GPIO4
SD2/IO9
SD_D2 (Series resistor: 100 ~ 200 Ω, 10 k pull-up resistor); GPIO9
SD3/CS
SD_D3 (Series resistor: 100 ~ 200 Ω, 10 k pull-up resistor); SLAVE_ SPI_CS
10
CMD/MOSI
SD_CMD (Series resistor: 100 ~ 200 Ω, 10 k pull-up resistor); SLAVE_ SPI_MOSI
11
GND
Ground
12
SCLK
SD_CLK (Series resistor: 100 ~ 200 Ω); SLAVE_ SPI_CLK
13
SD0/MISO
SD_D0 (Series resistor: 100 ~ 200 Ω, 10 k pull-up resistor); SLAVE_ SPI_MISO
14
SD1/INT
SD_D1 (Series resistor: 100 ~ 200 Ω, 10 k pull-up resistor); SLAVE_ SPI_INT
15
RXD
16
TXD
17
IO5
GPIO5
18
RST
Reset
19
ADC_IN
Tests the power-supply voltage of VDD3P3 and the input power voltage of TOUT.
These two functions cannot be used simultaneously.
20
EN
Chip enable pin (cannot be floating). Active high.
UART0_RXD, receive end in UART download;
GPIO3
UART0_TXD, transmit end in UART download, floating (internal pull-up) or pull up;
GPIO1
4/13
2016.08
3. Functional Description
3.
Functional Description
3.1. MCU
ESP8266EX contained in the ESP-WROOM-S2 integrates Tensilica L106 32-bit micro
controller (MCU) and a 16-bit RSIC. The CPU clock speed is 80 MHz and can reach a
maximum value of 160 MHz. The system can readily run a Real Time Operating System
(RTOS). Currently, the Wi-Fi stack only takes up 20% of CPU time. The remaining CPU time
(80% of total MIPS) can be used for user application. The MCU can work in conjunction
with the other parts of the chip through the following interfaces.
• Programmable RAM/ROM interface (iBus) that connects to memory controller and
can access the external flash.
• Data RAM interface (dBus) that connects to memory controller.
• AHB interface that accesses the register.
3.2. Memory
3.2.1.
Internal SRAM and ROM
ESP8266EX Wi-Fi SoC integrates memory controller including SRAM and ROM. MCU can
access the memory controller through iBus, dBus, and AHB interfaces. All these interfaces
can access ROM or RAM units. A memory arbiter determines the running sequence in the
arrival order of requests.
According to our current version of SDK, SRAM space available to users is assigned as
below.
• RAM size < 50 kB, that is, when ESP8266EX is working in Station mode and
connects to the router, available space in Heap + Data sector is around 50 kB.
• There is no programmable ROM in ESP8266EX, therefore, user program must be
stored in the SPI flash integrated into the ESP-WROOM-S2.
3.2.2.
SPI Flash
ESP8266EX supports SPI flash. Theoretically speaking, ESP8266EX can support up to 16
MB SPI flash.
ESP-WROOM-S2 currently integrates 2 MB SPI flash memory. ESP-WROOM-S2 supports
these SPI modes: Standard SPI, DIO (Dual I/O), DOUT (Dual Output), QIO (Quad I/O) and
QOUT (Quad Output).
Espressif
5/13
2016.08
3. Functional Description
Notice:
Please use the most updated download tool and configure SPI MODE in the download tool as DIO or
DOUT.
3.3. Crystal Oscillator
ESP-WROOM-S2 uses 26 MHz crystal oscillator. The accuracy of the crystal oscillator
should be ±10 PPM, and the operating temperature range is -20°C to 85°C.
When using the download tool, please note to select the right crystal oscillator type. In
circuit design, capacitors C1 and C2 which connect to the earth, are added to the input
and output terminals of the crystal oscillator respectively. The values of the two capacitors
can be flexible, ranging from 6 pF to 22 pF, however, the specific capacitive values depend
on further testing and adjustment on the overall performance of the whole circuit. Normally,
the capacitive values of C1 and C2 are within 10 pF for the 26 MHz crystal oscillator.
Crystal oscillator should be placed as close to the XTAL pins as possible (without the traces
being too long). It is good practice to add high density ground vias around the clock trace
for great insulation.
There should be no vias on the input and output traces, which means the traces cannot
cross layers.
Place the input and output bypass capacitors on the near left or right side of the chip. Do
not place them on the traces.
Do not route high-frequency digital signal lines in the four-layer board. It is best not to route
any signal line under the crystal oscillator. The larger the copper area on the top layer is, the
better. As crystal oscillator is a sensitive component, do not place magnetic components
such as high current inductance nearby.
Espressif
6/13
2016.08
3. Functional Description
3.4. Interface Description
Table 3-1. Interface Description
Interface
Pin
GPIO12/13/14/15 or
GPIO6/7/8/11
S2 can control SPI Slave as a Master or communicate with Host MCU as
a Slave. In overlap mode, S2 can share the SPI interface with Flash,
shifted by different CS signals.
PWM
Any available GPIO
(EXCEPT GPIO16)
Currently the demo provides 4 PWM channels (users can extend to 6
channels). PWM interface can realize the control of LED lights, buzzers,
relays, electronic machines, etc.
IR
Any available GPIO
(EXCEPT GPIO16)
The functionality of infrared remote control interface can be realized via
software programming. The interface uses NEC coding, modulation, and
demodulation. The frequency of modulated carrier signal is 38 kHz.
ADC
TOUT
Tests the power supply voltage of VDD3P3 (Pin 3 and Pin 4) and the input
power voltage of TOUT (Pin 6). However, these two functions cannot be
used simultaneously. This interface is typically used in sensors.
I2C
Any available GPIO
(EXCEPT GPIO16)
Connects to external sensors and display screens, etc.
SPI
UART0:
UART
TXD(U0TXD),
RXD(U0RXD)
UART1: IO2(TXD)
Espressif
Functional Description
Communicates with UART device.
Downloading: U0TXD + U0RXD or GPIO2 + U0RXD
Communicating (UART0): U0TXD, U0RXD
Debugging: UART1_TXD (GPIO2) can be used to print debugging
information.
7/13
2016.08
4. Electrical Characteristics
4.
Electrical Characteristics
Note:
Unless otherwise specified, measurements are based on VDD = 3.3 V, TA = 25°C.
4.1. Absolute Maximum Ratings
Table 4-1. Absolute Maximum Ratings
Rating
Condition
Value
Unit
Storage temperatue
-40 ~ 125
℃
Maximum soldering
temperature
260
℃
Supply voltage
IPC/JEDEC J-STD-020
3.0 ~ 3.6
4.2. Recommended Operating Conditions
Table 4-2. Recommended Operating Conditions
Operating condition
Symbol
Min
Typ
Max
Unit
Operating temperature
-40
20
125
℃
Supply voltage
VDD
3.0
3.3
3.6
4.3. Digital Terminal Characteristics
Table 4-3. Digital Terminal Characteristics
Terminals
Espressif
Symbol
Min
Typ
Max
Unit
Input logic level low
VIL
-0.3
0.25 VDD
Input logic level high
VIH
0.75 VDD
VDD + 0.3
Output logic level low
VOL
0.1 VDD
Output logic level high
VOH
0.8 VDD
8/13
2016.08
4. Electrical Characteristics
4.4. RF Performance
Table 4-4. RF Performance
Description
Min
Typ
Max
Unit
Input frequency
2400
Input impedance
50
Input reflection
-10
dB
PA output power at 72.2 Mbps
15.5
16.5
17.5
dBm
PA output power in 11b mode
16
17
18
dBm
2483.5
MHz
ohm
Sensitivity
CCK, 1 Mbps
-98
dBm
CCK, 11 Mbps
-91
dBm
6 Mbps (1/2 BPSK)
-93
dBm
54 Mbps (3/4 64-QAM)
-75
dBm
HT20, MCS7 (65 Mbps, 72.2 Mbps)
-72
dBm
Adjacent channel rejection
OFDM, 6 Mbps
37
dB
OFDM, 54 Mbps
21
dB
HT20, MCS0
37
dB
HT20, MCS7
20
dB
4.5. Sensitivity
Table 4-5. Sensitivity
Parameters
Min
Typ
Max
Unit
Input frequency
2412
24
MHz
Input impedance
50
Ω
Input reflection
-10
dB
PA output power at 72.2 Mbps
15.5
16.5
17.5
dBm
PA output power in 11b mode
16
17
18
dBm
Sensitivity
DSSS, 1 Mbps
Espressif
9/13
-98
dBm
2016.08
4. Electrical Characteristics
Parameters
Min
Typ
Max
Unit
CCK, 11 Mbps
-91
dBm
6 Mbps (1/2 BPSK)
-93
dBm
54 Mbps (3/4 64-QAM)
-75
dBm
HT20, MCS7 (65 Mbps, 72.2 Mbps)
-72
dBm
Adjacent channel rejection
OFDM, 6 Mbps
37
dB
OFDM, 54 Mbps
21
dB
HT20, MCS0
37
dB
HT20, MCS7
20
dB
4.6. Power Consumption
The following power consumption data were obtained from the tests with 3.3 V power
supply and a voltage stabilizer, in 25°C ambient temperature.
• All tests were performed at the antenna port without SAW filter.
• All data are based on 90% duty cycle in continuous transmission mode.
Table 4-6. Power Consumption
Modes
Espressif
Min
Typ
Max
Unit
Tx 802.11b, CCK 11 Mbps, POUT = +17 dBm
170
mA
Tx 802.11g, OFDM 54 Mbps, POUT = +15 dBm
140
mA
Tx 802.11n, MCS7, POUT = +13 dBm
120
mA
Rx 802.11b, 1024 bytes packet length , -80 dBm
50
mA
Rx 802.11g, 1024 bytes packet length , -70 dBm
56
mA
Rx 802.11n, 1024 bytes packet length , 65 dBm
56
mA
Modem-Sleep
15
mA
Light-Sleep
0.9
mA
Deep-Sleep
10
μA
Power Off
0.5
μA
10/ 13
2016.08
4. Electrical Characteristics
Notes:
Modem-Sleep is used when applications require CPU to be working, such as PWM or I2S applications.
In the scenarios where Wi-Fi connectivity is maintained and data transmission is not required, Wi-Fi
Modem circuit can be shut down to save power, according to 802.11 standards (such as U-APSD). For
example, in DTIM3, when ESP8266EX sleeps for 300 ms and wakes up for 3 ms to receive Beacon
packages from AP, the overall average current consumption is about 15 mA.
Light-Sleep is used for applications whose CPU may be suspended, such as Wi-Fi switch. In the
scenarios where Wi-Fi connectivity is maintained and data transmission is not required, Wi-Fi Modem
circuit and CPU can be shut down to save power, according to 802.11 standards (such as U-APSD). For
example, in DTIM3, when ESP8266EX sleeps for 300 ms and wakes up for 3 ms to receive Beacon
packages from AP, the overall average current consumption is about 0.9 mA.
Deep-Sleep is for applications that do not require Wi-Fi connectivity and only transmit data with long time
lags, e.g., a temperature sensor that measures temperature every 100 s. For example, when ESP8266EX
sleeps for 300 s then wakes up to connect to AP (taking about 0.3 ~ 1 s), the overall average current
consumption is far less than 1 mA.
4.7. Reflow Profile
Table 4-7. Reflow Profile
Indicator
Value
Ramp-up Rate (TS Max to TL)
3℃/second max.
Preheat
Espressif
Temperature Min. (TS Min.)
150℃
Temperature Typ. (TS Typ.)
175℃
Temperature Min. (TS Max.)
200℃
Time (TS)
60 ~ 180 seconds
Ramp-up Rate (TL to TP)
3℃/second max.
Time maintained above: Temperature (TL)/Time (TL)
217℃/60 ~ 150 seconds
Peak temperature (TP)
260℃ max, for 10 seconds
Target Peak Temperature (TP Target)
260℃ + 0/-5℃
Time within 5°C of actual Peak Temperature (TP)
20 ~ 40 seconds
TS max to TL (Ramp-down Rate)
6℃/second max.
Time 25°C to Peak Temperature (t)
8 minutes max.
11/ 13
2016.08
5. Schematics
'$$
8BSOJOH
5.
ny Changes or modifications not e pressly approved by the party responsible for compliance could
void the user s authority to operate the e uipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
&>ĂďĞů/ŶƐƚƌƵĐƚŝŽŶƐ͗
The outside of final products that contains this module device must display a label referring to the enclosed
module. This e terior label can use wording such as: Contains Transmitter odule
FCC ID: 2 C
ROO 2 or Contains FCC ID: 2 C
ROO 2 ny similar wording that e presses the
same meaning may be used.
&ZĂĚŝĂƚŝŽŶdžƉŽƐƵƌĞ^ƚĂƚĞŵĞŶƚ͗
  To satisfy FCC RF posure re uirements for this transmission devices, a separation distance of 2 cm or
more should be maintained between the antenna of this device and persons during operation. To ensure
compliance, operation at closer than this distance is not recommended. The antenna(s) used for this
transmitter must not be co located or operating in conjunction with any other antenna or transmitter.
Espressif
12/ 13
2016.08
Disclaimer and Copyright Notice
Information in this document, including URL references, is subject to change without
notice.
THIS DOCUMENT IS PROVIDED AS IS WITH NO WARRANTIES WHATSOEVER,
INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, FITNESS
FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT
OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.
All liability, including liability for infringement of any proprietary rights, relating to use of
information in this document is disclaimed. No licenses express or implied, by estoppel or
otherwise, to any intellectual property rights are granted herein.
The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is
a registered trademark of Bluetooth SIG.
Espressif IOT Team
All trade names, trademarks and registered trademarks mentioned in this document are
property of their respective owners, and are hereby acknowledged.
www.espressif.com
Copyright © 2016 Espressif Inc. All rights reserved.

---

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